Calayan is a municipality in the province of Cagayan, Philippines. According to the 2015 census, it has a population of 16,702 people. It is located in the Luzon Strait north of Luzon Island. The town is composed of four of the five major islands of the Babuyan Islands namely: Calayan, Camiguin, Dalupiri and Babuyan Island. Calayan Island is the largest of the Babuyan Islands. Fuga Island, the fifth island within the Babuyan Islands, is part of Aparri municipality.